Recently, my aunt handed down her 2007 rally yellow SS to me. Today, i went to go and try and get it started and it would crank and sometimes start with both a refurbished 525 CCA from 2024 and a brand new 525 from 5/26 and a jump pack, but not a brand new 590 CCA battery by itself. i'm getting headlights, dash, radio, domes, reverse/tail, and trunk, but no crank. it was iffy on all the batteries, but it would make an attempt. it could be the relays, but i doubt it due to it starting and idling. tomorrow when i go back to my aunt's house i'll try to get a video of the issue.

any help is appreciated!